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[" The value of "],[cos(pi)/(15)cos(2 pi...

[" The value of "],[cos(pi)/(15)cos(2 pi)/(15)cos(3 pi)/(15)cos(4 pi)/(15)cos(5 pi)/(15)cos(6 pi)/(15)cos(7 pi)/(15)=],[([" (a) "(1)/(2^(6))," (b) "(1)/(2^(7))]quad (c)(1)/(2^(g))quad " (d) mone of these "]

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